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Hello Sir!
I'm a bit confused with this sentence to form a question : The river Tiber flowed round the town so people were safer in Rome.
Would this be the question : Which river did flow round the town so people were safer I Rome?
Thanks in advance!

The phrase is grammatically correct, but we generally use 'good to hear' in reference to good news or some positive comment rather than in the context of nice music. To talk about music we might say 'It's nice to listen to' or 'It's good listening'.

The second sentence is the standard form in most any major variety of English spoken around the world. The first one is not as common and you can hear it more often in some varieties of English. There is no difference in meaning between them.

In any case, I'd recommend you use the second one, especially if you're in an English class, as it is the more widely-considered standard form of the two.

Question tags are a bit unusual after imperative verb forms, and if you use them, please be aware that people might think you are being quite rude. In this case, either 'will you' or 'would you' is grammatically correct. In theory, 'would' is a bit more polite than 'will', but as I mentioned earlier, both are potentially rude if used with a serious tone.